Beefy Boxes and Bandwidth Generously Provided by pair Networks
Clear questions and runnable code
get the best and fastest answer
 
PerlMonks  

Re: Diff on hashes

by robartes (Priest)
on Nov 12, 2002 at 14:31 UTC ( #212267=note: print w/replies, xml ) Need Help??


in reply to Diff on hashes

I've recently done something similar in an environment where I can't use modules for various reasons, some of them even valid. Basically, you delete entries that are common to both hashes from both hashes. The hash with old entries will end up with the entries to delete, the one with new entries with the entries to add. A modification of an entry will become a delete/create.
use strict; use Data::Dumper; my %oldhash=( '1.1.1.1' => 'nfs,1', '4.4.4.4' => 'cifs,0', '10.0.4.2' => 'afp,1', '3.3.3.3' => 'nfs,0', '5.5.5.5' => 'afp,0', ); my %newhash=( '1.1.1.1' => 'nfs,1', '7.7.7.7' => 'cifs,0', '10.0.4.2' => 'afp,2', '3.3.3.3' => 'nfs,0', '5.5.5.5' => 'afp,0', '6.6.6.6' => 'cifs,1', ); foreach my $ip (keys %newhash) { if (exists($oldhash{$ip}) && $newhash{$ip} eq $oldhash{$ip}) { delete $oldhash{$ip}; delete $newhash{$ip}; } } print "Entries to remove:\n"; print Dumper(\%oldhash); print "Entries to add:\n"; print Dumper(\%newhash);
Note that your current data structure is limited: if you have an IP that serves multiple protocols, you'll need to step up to a HoA or a HoH (and my code above will break).

CU
Robartes-

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://212267]
help
Chatterbox?
Tanktalus has to figure out why his cb talker isn't working :(
[choroba]: https?
[choroba]: That was at least why my cb talker wasn't working.
[Tanktalus]: curious, then, why the reader works :)
[Tanktalus]: or posting the last hour of cb... well, maybe I should double check that first :)
[Tanktalus]: yup, it's working. :)
[choroba]: https://github. com/choroba/pm-cb/ commit/7b57f513596 7bf8a29d74f1c307de 9a76894cdcf
[choroba]: Also, a thread here on PM mentioned that one of perlmonks.com or www.perlmonks.com should now work

How do I use this? | Other CB clients
Other Users?
Others rifling through the Monastery: (5)
As of 2018-07-15 21:28 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?
    It has been suggested to rename Perl 6 in order to boost its marketing potential. Which name would you prefer?















    Results (326 votes). Check out past polls.

    Notices?